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- Complementary Index21,313,856
- Gale General OneFile6,814,101
- Springer Nature Journals6,804,706
- Academic Search Index3,073,375
- OpenAIRE2,341,036
- eBook Index1,810,395
- MEDLINE1,536,519
- Directory of Open Access Journals1,075,425
- Supplemental Index671,232